Are bone density and bone cortex the same concept? Thank you! 15

Of course not, the bone cortex is equivalent to the skin of bamboo, and the bone density is generally flat bones, such as the bone body of the shoulder blade, in general, the bone density and the cancellous bone belong to the bone tissue, and the bone tissue constitutes the bone substance.

The bone dense texture is dense, the compression resistance and nerve flexure resistance are very strong, and it is distributed on the bone surface.

The bony density of the flat bones is distributed on the surface and is called the inner and outer plates. The cancellous bone is distributed in the middle, which is called the plate barrier. The bone marrow fills the mesh of the cancellous bone.

The epiphysis of short and long bones is a thin layer of dense bone on the periphery and a large amount of cancellous bone on the inside. The arrangement of the trabeculae shows two cardinal directions, one is consistent with the direction of gravity, called the pressure curve; The other is consistent with the direction of the tensile force of the muscle, called the tension curve. The two constitute the most effective mechanical system of bearing force.

In the process of life, due to the influence of various factors such as labor, training, and disease, bone shows great plasticity, such as the thickening of the metatarsal bone of a ballet dancer, and the thickening of the bone density; thickening of the metacarpal and phalange diaphylaxis of truck drivers; In patients who have been bedridden for a long time, the trabecular pressure curve system of the lower limbs becomes insignificant.

Histologically, bone tissue can be divided into lamellar and non-lamellar bone. After one year of age, all bones in the human body are made up of lamellar bone. Mature bone tissue is often lamellar and is called bone lamella

The collagen fibers in the interstitium are arranged in layers, with fibers in the same plate parallel to each other and fibers in adjacent plates perpendicular to each other.

The cortex is the dense bone that is distributed on the peripheral surface of the bones.

Both compact and cancellous bone are composed of cells, fibers, and matrix, which belong to bone tissue. Bone tissue, in turn, makes up bone.

Gentle bone dense texture is dense, compressive and anti-flexure is very strong, and it is distributed on the surface of the bone. The bony density of the flat bones is distributed on the surface and is called the inner and outer plates.

The cancellous bone is distributed in the middle, which is called the plate barrier. The cancellous bone is spongy and consists of many lamellar trabeculae intertwined and distributed on the inside of the bone.

The epiphysis of the short and long bones is a thin layer of bone dense on the periphery and a large amount of osteoporophysis on the inside.

In the process of life, bone shows great plasticity due to the influence of various factors such as labor, training, and disease. For example, the metatarsal bones of ballet dancers thicken, and the dense bones thicken.

Answer] Birang: Bone dense matter is mainly composed of several regularly arranged bone plates and bone cells, blood vessels and nerves scattered in them.

1) Annular bone plate: the outer ring bone plate is thick, distributed on the outer surface of the bone, and is multi-layered; The inner ring bone plate is thin, distributed on the inner surface of the bone, and the number of layers is small. It can be seen that there is a perforator, which is a channel for blood vessels and nerves.

2) Osteopone: It is the main structure, located between the inner and outer bone plates; It is composed of a ** tube and a multi-layered bone plate surrounded by it. There are also blood vessels and nerves passing through the central tube.

3) Interosseous plates: It is an irregular bony plate located between the bony units in the hand-held bureau, which is the remnant part of the old bonus.

Osteophysis: It is composed of bone tissue, which is divided into compact bone and cancellous bone.

Bone matrix: The basis of bone tissue, its chemical composition includes organic matrix and inorganic components (bone salts).

Bone compactness: dense texture, high pressure resistance, distributed on the surface of the bone cancellous: spongy, arranged by intertwined bone trabeculae, distributed in the inside of the bone.